Spatial frequency is the number of oscillation cycles per unit length. A ripple with spatial period has frequency ; its angular wavenumber is . In two dimensions the spatial-frequency vector specifies the orientation and period of a plane-wave pattern.
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Spatial frequency is a concept used in various fields, including image processing, optics, and signal processing, to describe how rapidly changes occur in a spatial domain, such as an image or a physical signal. It quantifies the frequency with which changes in intensity or color occur in space. In more technical terms, spatial frequency refers to the number of times a pattern (like a texture or a sinusoidal wave) repeats per unit of distance. It is often measured in cycles per unit length (e.